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<div class="title">Tuple.h</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// This file is part of Eigen, a lightweight C++ template library</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// for linear algebra.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Copyright (C) 2021 The Eigen Team</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// This Source Code Form is subject to the terms of the Mozilla</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">// Public License v. 2.0. If a copy of the MPL was not distributed</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; </div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#ifndef EIGEN_TUPLE_GPU</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#define EIGEN_TUPLE_GPU</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;utility&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160; </div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">// This is a replacement of std::tuple that can be used in device code.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; </div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceEigen.html">Eigen</a> {</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span>tuple_impl {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; </div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">// Internal tuple implementation.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> N, <span class="keyword">typename</span>... Types&gt;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="keyword">class </span>TupleImpl;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160; </div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">// Generic recursive tuple.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> N, <span class="keyword">typename</span> T1, <span class="keyword">typename</span>... Ts&gt;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="keyword">class </span>TupleImpl&lt;N, T1, Ts...&gt; {</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;  <span class="comment">// Tuple may contain Eigen types.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  EIGEN_MAKE_ALIGNED_OPERATOR_NEW</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  </div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;  <span class="comment">// Default constructor, enable if all types are default-constructible.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U1 = T1, <span class="keyword">typename</span> EnableIf = std::enable_if_t&lt;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;      std::is_default_constructible&lt;U1&gt;::value</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;      &amp;&amp; reduce_all&lt;std::is_default_constructible&lt;Ts&gt;::value...&gt;::value</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    &gt;&gt;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;  EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;  TupleImpl() : head_{}, tail_{} {}</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160; </div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;  <span class="comment">// Element constructor.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> U1, <span class="keyword">typename</span>... Us, </div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;           <span class="comment">// Only enable if...</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;           <span class="keyword">typename</span> EnableIf = std::enable_if_t&lt;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;              <span class="comment">// the number of input arguments match, and ...</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;              <span class="keyword">sizeof</span>...(Us) == <span class="keyword">sizeof</span>...(Ts) &amp;&amp; (</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                <span class="comment">// this does not look like a copy/move constructor.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                N &gt; 1 || std::is_convertible&lt;U1, T1&gt;::value)</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;           &gt;&gt;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;  TupleImpl(U1&amp;&amp; arg1, Us&amp;&amp;... args) </div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    : head_(std::forward&lt;U1&gt;(arg1)), tail_(std::forward&lt;Us&gt;(args)...) {}</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160; </div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;  <span class="comment">// The first stored value. </span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;  T1&amp; head() {</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keywordflow">return</span> head_;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  }</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  </div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <span class="keyword">const</span> T1&amp; head()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    <span class="keywordflow">return</span> head_;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;  }</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;  </div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;  <span class="comment">// The tail values.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;  TupleImpl&lt;N-1, Ts...&gt;&amp; tail() {</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="keywordflow">return</span> tail_;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;  </div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  <span class="keyword">const</span> TupleImpl&lt;N-1, Ts...&gt;&amp; tail()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="keywordflow">return</span> tail_;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;  }</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;  </div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;  <span class="keywordtype">void</span> swap(TupleImpl&amp; other) {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keyword">using</span> numext::swap;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    swap(head_, other.head_);</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    swap(tail_, other.tail_);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;  }</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;  </div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... UTypes&gt;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;  TupleImpl&amp; operator=(<span class="keyword">const</span> TupleImpl&lt;N, UTypes...&gt;&amp; other) {</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    head_ = other.head_;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    tail_ = other.tail_;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;  }</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;  </div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... UTypes&gt;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;  TupleImpl&amp; operator=(TupleImpl&lt;N, UTypes...&gt;&amp;&amp; other) {</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    head_ = std::move(other.head_);</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    tail_ = std::move(other.tail_);</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;  }</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;  </div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;  <span class="comment">// Allow related tuples to reference head_/tail_.</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  <span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> M, <span class="keyword">typename</span>... UTypes&gt;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  <span class="keyword">friend</span> <span class="keyword">class </span>TupleImpl;</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160; </div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  T1 head_;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  TupleImpl&lt;N-1, Ts...&gt; tail_;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;};</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160; </div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">// Empty tuple specialization.</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="keyword">template</span>&lt;&gt;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="keyword">class </span>TupleImpl&lt;size_t(0)&gt; {};</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160; </div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> TupleType&gt;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="keyword">struct </span>is_tuple : std::false_type {};</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160; </div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Types&gt;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="keyword">struct </span>is_tuple&lt; TupleImpl&lt;sizeof...(Types), Types...&gt; &gt; : std::true_type {};</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160; </div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;<span class="comment">// Gets an element from a tuple.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> Idx, <span class="keyword">typename</span> T1, <span class="keyword">typename</span>... Ts&gt;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="keyword">struct </span>tuple_get_impl {</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;  <span class="keyword">using</span> TupleType = TupleImpl&lt;<span class="keyword">sizeof</span>...(Ts) + 1, T1, Ts...&gt;;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;  <span class="keyword">using</span> ReturnType = <span class="keyword">typename</span> tuple_get_impl&lt;Idx - 1, Ts...&gt;::ReturnType;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;  </div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  ReturnType&amp; run(TupleType&amp; tuple) {</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keywordflow">return</span> tuple_get_impl&lt;Idx-1, Ts...&gt;::run(tuple.tail());</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  }</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160; </div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;  <span class="keyword">const</span> ReturnType&amp; run(<span class="keyword">const</span> TupleType&amp; tuple) {</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keywordflow">return</span> tuple_get_impl&lt;Idx-1, Ts...&gt;::run(tuple.tail());</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;  }</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;};</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160; </div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="comment">// Base case, getting the head element.</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T1, <span class="keyword">typename</span>... Ts&gt;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="keyword">struct </span>tuple_get_impl&lt;0, T1, Ts...&gt; {</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;  <span class="keyword">using</span> TupleType = TupleImpl&lt;<span class="keyword">sizeof</span>...(Ts) + 1, T1, Ts...&gt;;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  <span class="keyword">using</span> ReturnType = T1;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160; </div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  T1&amp; run(TupleType&amp; tuple) {</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="keywordflow">return</span> tuple.head();</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;  }</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160; </div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;  <span class="keyword">const</span> T1&amp; run(<span class="keyword">const</span> TupleType&amp; tuple) {</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    <span class="keywordflow">return</span> tuple.head();</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;  }</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;};</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="comment">// Concatenates N Tuples.</span></div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> NTuples, <span class="keyword">typename</span>... Tuples&gt;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="keyword">struct </span>tuple_cat_impl;</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160; </div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> NTuples, <span class="keywordtype">size_t</span> N1, <span class="keyword">typename</span>... Args1, <span class="keywordtype">size_t</span> N2, <span class="keyword">typename</span>... Args2, <span class="keyword">typename</span>... Tuples&gt;</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="keyword">struct </span>tuple_cat_impl&lt;NTuples, TupleImpl&lt;N1, Args1...&gt;, TupleImpl&lt;N2, Args2...&gt;, Tuples...&gt; {</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;  <span class="keyword">using</span> TupleType1 = TupleImpl&lt;N1, Args1...&gt;;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;  <span class="keyword">using</span> TupleType2 = TupleImpl&lt;N2, Args2...&gt;;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;  <span class="keyword">using</span> MergedTupleType = TupleImpl&lt;N1 + N2, Args1..., Args2...&gt;;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;  </div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  <span class="keyword">using</span> ReturnType = <span class="keyword">typename</span> tuple_cat_impl&lt;NTuples-1, MergedTupleType, Tuples...&gt;::ReturnType;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;  </div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;  <span class="comment">// Uses the index sequences to extract and merge elements from tuple1 and tuple2,</span></div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;  <span class="comment">// then recursively calls again.</span></div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Tuple1, <span class="keywordtype">size_t</span>... I1s, <span class="keyword">typename</span> Tuple2, <span class="keywordtype">size_t</span>... I2s, <span class="keyword">typename</span>... MoreTuples&gt;</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;  ReturnType run(Tuple1&amp;&amp; tuple1, std::index_sequence&lt;I1s...&gt;,</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;                 Tuple2&amp;&amp; tuple2, std::index_sequence&lt;I2s...&gt;,</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;                 MoreTuples&amp;&amp;... tuples) {</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;    <span class="keywordflow">return</span> tuple_cat_impl&lt;NTuples-1, MergedTupleType, Tuples...&gt;::run(</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;        MergedTupleType(tuple_get_impl&lt;I1s, Args1...&gt;::run(std::forward&lt;Tuple1&gt;(tuple1))...,</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;                        tuple_get_impl&lt;I2s, Args2...&gt;::run(std::forward&lt;Tuple2&gt;(tuple2))...),</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;        std::forward&lt;MoreTuples&gt;(tuples)...);</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;  }</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;  </div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;  <span class="comment">// Concatenates the first two tuples.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Tuple1, <span class="keyword">typename</span> Tuple2, <span class="keyword">typename</span>... MoreTuples&gt;</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;  ReturnType run(Tuple1&amp;&amp; tuple1, Tuple2&amp;&amp; tuple2, MoreTuples&amp;&amp;... tuples) {</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    <span class="keywordflow">return</span> run(std::forward&lt;Tuple1&gt;(tuple1), std::make_index_sequence&lt;N1&gt;{},</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;               std::forward&lt;Tuple2&gt;(tuple2), std::make_index_sequence&lt;N2&gt;{},</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;               std::forward&lt;MoreTuples&gt;(tuples)...);</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;  }</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;};</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160; </div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;<span class="comment">// Base case with a single tuple.</span></div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> N, <span class="keyword">typename</span>... Args&gt;</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;<span class="keyword">struct </span>tuple_cat_impl&lt;1, TupleImpl&lt;N, Args...&gt; &gt; { </div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;  <span class="keyword">using</span> ReturnType = TupleImpl&lt;N, Args...&gt;;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;  </div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Tuple1&gt;</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;  ReturnType run(Tuple1&amp;&amp; tuple1) {</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    <span class="keywordflow">return</span> tuple1;</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;  }</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;};</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160; </div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;<span class="comment">// Special case of no tuples.</span></div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;<span class="keyword">template</span>&lt;&gt;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;<span class="keyword">struct </span>tuple_cat_impl&lt;0&gt; { </div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;  <span class="keyword">using</span> ReturnType = TupleImpl&lt;0&gt;;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;  <span class="keyword">static</span> EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;  ReturnType run() {<span class="keywordflow">return</span> ReturnType{}; }</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;};</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160; </div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;<span class="comment">// For use in make_tuple, unwraps a reference_wrapper.</span></div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;<span class="keyword">struct </span>unwrap_reference_wrapper { <span class="keyword">using</span> type = T; };</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160; </div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;<span class="keyword">struct </span>unwrap_reference_wrapper&lt;std::reference_wrapper&lt;T&gt; &gt; { <span class="keyword">using</span> type = T&amp;; };</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160; </div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;<span class="comment">// For use in make_tuple, decays a type and unwraps a reference_wrapper.</span></div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;<span class="keyword">struct </span>unwrap_decay {</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;  <span class="keyword">using</span> type = <span class="keyword">typename</span> unwrap_reference_wrapper&lt;typename std::decay&lt;T&gt;::type&gt;::type;</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;};</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160; </div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> Tuple&gt;</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;<span class="keyword">struct </span>tuple_size;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160; </div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Types &gt;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;<span class="keyword">struct </span>tuple_size&lt; TupleImpl&lt;sizeof...(Types), Types...&gt; &gt; : std::integral_constant&lt;size_t, sizeof...(Types)&gt; {};</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160; </div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> Idx, <span class="keyword">typename</span>... Types&gt;</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;<span class="keyword">const</span> <span class="keyword">typename</span> tuple_get_impl&lt;Idx, Types...&gt;::ReturnType&amp;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;get(<span class="keyword">const</span> TupleImpl&lt;<span class="keyword">sizeof</span>...(Types), Types...&gt;&amp; tuple) {</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;  <span class="keywordflow">return</span> tuple_get_impl&lt;Idx, Types...&gt;::run(tuple);</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;}</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160; </div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">size_t</span> Idx, <span class="keyword">typename</span>... Types&gt;</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;<span class="keyword">typename</span> tuple_get_impl&lt;Idx, Types...&gt;::ReturnType&amp;</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;get(TupleImpl&lt;<span class="keyword">sizeof</span>...(Types), Types...&gt;&amp; tuple) {</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;  <span class="keywordflow">return</span> tuple_get_impl&lt;Idx, Types...&gt;::run(tuple);</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;}</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160; </div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Tuples,</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;          <span class="keyword">typename</span> EnableIf = std::enable_if_t&lt;</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;            internal::reduce_all&lt;</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;              is_tuple&lt;typename std::decay&lt;Tuples&gt;::type&gt;::value...&gt;::value&gt;&gt;</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;<span class="keyword">typename</span> tuple_cat_impl&lt;<span class="keyword">sizeof</span>...(Tuples), <span class="keyword">typename</span> std::decay&lt;Tuples&gt;::type...&gt;::ReturnType</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;tuple_cat(Tuples&amp;&amp;... tuples) {</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;  <span class="keywordflow">return</span> tuple_cat_impl&lt;<span class="keyword">sizeof</span>...(Tuples), <span class="keyword">typename</span> std::decay&lt;Tuples&gt;::type...&gt;::run(std::forward&lt;Tuples&gt;(tuples)...);</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;}</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160; </div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args, <span class="keyword">typename</span> ReturnType = TupleImpl&lt;<span class="keyword">sizeof</span>...(Args), Args&amp;...&gt; &gt;</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;ReturnType tie(Args&amp;... args) EIGEN_NOEXCEPT {</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    <span class="keywordflow">return</span> ReturnType{args...};</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;}</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160; </div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args, <span class="keyword">typename</span> ReturnType = TupleImpl&lt;<span class="keyword">sizeof</span>...(Args), <span class="keyword">typename</span> unwrap_decay&lt;Args&gt;::type...&gt; &gt;</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;ReturnType make_tuple(Args&amp;&amp;... args) {</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;  <span class="keywordflow">return</span> ReturnType{std::forward&lt;Args&gt;(args)...};</div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;}</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160; </div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args&gt;</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;EIGEN_CONSTEXPR EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE</div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;TupleImpl&lt;<span class="keyword">sizeof</span>...(Args), Args...&gt; forward_as_tuple(Args&amp;&amp;... args) {</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;  <span class="keywordflow">return</span> TupleImpl&lt;<span class="keyword">sizeof</span>...(Args), Args...&gt;(std::forward&lt;Args&gt;(args)...);</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;}</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160; </div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Types&gt;</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;<span class="keyword">using</span> tuple = TupleImpl&lt;<span class="keyword">sizeof</span>...(Types), Types...&gt;;</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160; </div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;}  <span class="comment">// namespace tuple_impl</span></div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;}  <span class="comment">// namespace internal</span></div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;}  <span class="comment">// namespace Eigen</span></div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160; </div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// EIGEN_TUPLE_GPU</span></div>
<div class="ttc" id="anamespaceEigen_html"><div class="ttname"><a href="namespaceEigen.html">Eigen</a></div><div class="ttdoc">Namespace containing all symbols from the Eigen library.</div><div class="ttdef"><b>Definition:</b> Core:139</div></div>
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